AMERICAN 
JOURNAL OF BOTANY 
Devoted to All Branches of Botanical Science 
Established 1914 
EDITED BY A COMMITTEE OF THE 
BOTANICAL SOCIETY OF AMERICA 
EDITORIAL committee 
C. E. AlleI^, Editor-in-Chief, 
University of Wisconsin 
William Crocker, H. H. Bartlett, 
Tlie Thompson Institute University of Michigan 
For Plant Research, Inc. 
^ c' • A/r Arthur H. Graves, 
C. Stuart Gager, Business Manager -r, 7r t> , - ^ 1 
n rj -n ^ • ^ J Brooklyn Botanic Garden 
Brooklyn Botamc Garden 
R. A. Harper, I. F. Lewis, 
Columbia University University of Virginia 
C. L. Shear, Bureau of Plant Industry 
(Representing American Phytopathological Society) 
The Journal is published monthly, except during August and September. 
Subscription price, $6.00 a year. Postage to Canada, 20 cents; to other foreign 
countries (except Mexico and Cuba) 40 cents a volume on annual subscriptions. 
Single copies 75 cents. Back numbers, 75 cents ea.ch; ^7.00 a volume, post free. 
The pages of the Journal are open to members of the Botanical Society of 
America, or tacandidates approved for membership. 
Manuscript offered fdr publication should be typewritten, and should in all 
cases be submitted to the Editor-in-Chief. 
Papers are limited to 20 pages in length, exclusive of plates, except that ad- 
ditional pages may be arranged for at cost rate to authors (approxirfiately $3.00 a 
page). 
Proofs should be corrected immediately on receipt, and returned to American 
Journal of Botany, Brooklyn Botanic Garden, Brooklyn, N. Y. 
Illustrations, other than zinc etchings, and tabular matter should, in general, 
be restricted to approximately ten percent of the number of pages of text. Authors 
vnay be charged at cost rates for illustrations' and tabular matter in excess of that 
amount (approximately $6.40 a page for tabular matter; 15 cents per ^qu^re inch 
for half-tones) » . 
Separates should be ordered when proof is returned. Fifty copies without 
cover will be supplied free; cover and additional copies at cost. 
Remittances should be made payable to American Journal of Botany. Ten 
cents must be added to ail checks not drawn on New York City banks. 
Claims for missing numbers should be made within 30 days following their 
date of mailing. ,The publishers will supply missing numbers free only when they 
have been lost in the mails. 
Correspondence concerning editorial matters should be addressed to Prof. C. 
E. Allen, University of Wisconsin, Madison, Wisconsin. 
Business cotrespondence, including notice of change of address, and directions 
concerning reprints, should be addressed to American Journal of Botany, Brooklyn 
Botanic Garden, Brooklyn, N. Y., or The New Era Printing Co., Inc., Lancaster, Pa. 
